The progressive wing of the Democrat Party made its presence known in the 2016 presidential race with the campaign of Vermont Sen. Bernie Sanders. His socialist platform of free health care, free college, higher minimum wages and the like made him a popular choice of progressives, a fancy name for Democrats who have no real concept of how economics work. As loveable as a crumudgeon as Sanders was to his supporters, he’s a little long in the tooth to build a political movement around for the 2020s. Enter Alexandria Ocasio-Cortez, a 28-year-old Latino woman who is a member of the...